I'm no expert, so I'm replying here as much to validate my own critique as I am to provide solid advice. Perhaps it will be of some help though...

First, it looks to me like your hips are too low in your starting positions. Your hips should be a bit higher so your shoulders are slightly in front of the bar. Second, when you start your lift, you start with your hips. Your shoulders and hips should come up at the same rate during the first pull. In other words, your torso angle should stay the same relative to the ground. These two faults may cancel each other out for the most part.. This is where my lack of expertise come through; I'm not sure how big of a problem you have, if at all. It would be interesting to here other thoughts on this.